Mountaineering is the sport,hobby or profession of walking,hiking,trekking and climbing up mountains.It is also sometimes known as alpinism,particularly in Europe.While it began as an all-out attempt to reach the highest point of unclimbed mountains,it has branched into specializations addressing different aspects of mountains and may now be said to consist of three aspects:rock-craft,snow-craft and skiing,depending on whether the route chosen is over rock,snow or ice.All require great athletic and technical ability,and experience is also a very important part of the matter.